Newbie programmer question: How do parsers work?(Python examples?)

[Terry Reedy]

"bio_enthusiast" <lancepickens at gmail.com> wrote in message 
news:1156535724.221400.175230 at m79g2000cwm.googlegroups.com...
>I was wondering exactly how you create a parser. I'm learning
> Python and I recently have come across this material. I'm interested
> in the method or art of writing a parser.
>
> If anyone has some python code to post for an abstract parser, or links
> to some informative tutorials, that would be great.

I believe the book 'Text Processing in Python" (or something like that) by 
Mertz has info on parsing and modules written in Python that does such.

tjr